I found this easiest to get on the second Hospital - as you follow the mandatory tasks, you'll end up with two additional buildings to use.
Put the game into fast mode (The right pointing arrow next to the green play button), and add extra rooms/staff as money allows. Try to have a good spread of rooms to ensure faster income.
You'll also fairly easily get three stars on this level during the process of this, as one of the final tasks involves having a level 10 hospital. (if you struggle on attractiveness use plants + posters)